The JBL EON518S is an 18", direct-radiating, high performance powered compact subwoofer speaker system designed to extend low frequency performance of any EON system. The JBL subwoofer also offers the convenience of an integrated crossover and stereo loop-thru capability. The EON518S is comprised of a 460 mm (18") Differential Drive woofer driven by a 500W Class-D digital amplifier. The amplifier input panel offers stereo or mono line level inputs via balanced XLR connectors as well as a single channel speaker level input via a 1/4 inch TS phone jack. Signal processing, crossover functionality and limiting for the system is integrated into the input section functionality. Overall subwoofer input sensitivity is controlled by a single easy-grip knob and a simple switch enables polarity reversal for sub/satellite system optimization. It's signal present and limit lights indicate performance status and JBL provides an additional switch to kill the illuminated logo in theater applications. The speaker enclosure has been engineered for maximum performance and absolute minimum size. Constructed of 18 mm plywood it is coated in JBL's rugged DuraFlex finish. It also features a full screen-backed steel grille designed into a rugged copolymer bezel for maximum component protection. For comfortable portability the EON518S subwoofer features 2 large ergonomic rubber grip handles.

I have a pair of JBL EON G2s (15") and thought they worked great for about 6 months. I couldn't produce the low end we needed so I got a pair of these to complete the system. All I can say is that the sound OPENED UP for the whole frequency range. It makes the G2s sound SO much better. No longer do they have to do all the work. Here is the key though, YOU NEED the dbx Driverack PX or PA to use these properly. Once the full system was set up, I have not had to turn a dial. Amazing at what you can get now with the built in and dedicated internal power. And with a great Amercian company like JBL, you can't go wrong.

I bought the 518's to go with a pair of EON 515's to replace an older passive system. Their best attribute is the convenience of the integrated amps and their portability. They are ridiculously light, but also pack a pretty good thump.I ordered the 515's and a pair of the 518S subs, but they arrived a day apart. When I got the 515's first, I tried them out by themselves and initially, I was really concerned about the output. They sounded really nice at low volumes, but if you boost the low frequencies and turn them up, they peak fairly easily. Bass eats up that 350 watts pretty fast.Once I got the subs and split the signal with the built-in high-pass filter, it was a different story. I ended up getting really nice and unexpected clarity and tone. Vocals and guitar were reproduced nicely - and at significant volume. This would not have been the case without the use of these subs.Based on my applications, the 518's produced all of the bottom end I needed, and had plenty to spare. It produced really thick and clean-sounding kick drum and bass, and even enhanced guitar and vocals.I would have liked to have seen a more detailed user manual. It's very basic. The 518's have a polarity switch, but the manual doesn't say much about it other than, "if the bass response isn't what you like, try flipping the switch" (basically). Doesn't explain what the polarity function is, or what flipping the switch does.Overall, I'm very pleased with these subs. They are a vital companion to the 515's.

For many moons I have been a Passive DJ. Passive in respect to the systems I own. I have the ability to use 4-L's in a tri-amp system of QSC's and break down to small, when needed, system with JBL 15 and a small QSC amp. I recently bought Mackie's a year ago and needed subs. I did my research and purchased 2 EON's to go with them. Bottom line, for venues of up to 450 people-- I killed them. I tested the EONs for 2 gigs this weekend and tried to push them out the box. They held their ground with no distortion. My Tri-amp system will now rest a very long time. PS:Friends who want to get more from this speaker should be using a passive system for a venue of 700 people or more -- keep it real!!

I returned it because I couldn't get it loud enough nor was the bass as deep as I wanted it. I'm a mobile weekend DJ and wanted a lightweight, powered sub that could fit under my DJ table, be easily moved, and would free up my Yamaha 512 mixer/amp to run 2 pairs of high end speakers (4 ohm load). Unfortunately, I couldn't get it as loud and deep as I wanted it. I wish the input gain on the sub had a little higher gain setting "11". Also, the lowest frequencies weren't any lower or more ground shaking than my current Behringer sub. If I didn't need the ground to shake, this would be an excellent mobile sub but for some one who really likes deep, ground shaking subsonic oomph, you may want to look elsewhere.

I recently bought the EON 518S and I love the item. The speaker sounds great and really enhances my performance. By purchasing the sub, I shed about 110 pounds of equipment. I am very happy with the weight of the EON sub. As a matter of fact, I can't believe that so much sound can come from something so lightweight. The built in crossover really makes a difference when the sub is paired with the EON 515 speakers. There is a substantial sound separation when you hook them all together. Did I mention that the speaker is also very good looking? My only disappointment is in the so called, "Rebate" offer. The wording is slightly deceptive and should be changed. I tried to contact Harmon Kardon, but they never responded. Poor customer service on their part.